The Army was using those type of vehicles since the establishment of the Joint Readiness Training Center at Ft Chaffee and later at Ft Polk. It was vehicle used by the observer/controllers and support staff.

The Airborne and Special Ops forces have so far opted to pursue a ultra light vehicle like the one shown instead of adopting the Joint Light Tactical Vehicle the rest of the Army is fielding to replace the armored HMMWV.

Yes, it is officially designated M18 Cart, Golf Bouncy Thing-a-ma-gig. Nickname: "Whole In Won."It is served by a crew of 4; Driver, Backseat Driver, Assistant-Backseat Driver and, Picker-Upper of Things That Fall Off. The Command version includes a built-in ball washer and greasepaint dispenser kit. They are built under license from the big US firm Caddylac.

Yeah, the quads are pretty popular. Relatively cheap, and available in both gas and diesel versions.

The Airborne and Special Ops forces have so far opted to pursue a ultra light vehicle like the one shown instead of adopting the Joint Light Tactical Vehicle the rest of the Army is fielding to replace the armored HMMWV.

Well, yeah, you need a really big helicopter to haul a 14,000lb JLTV around as a sling load. They don't fit inside any US helicopter, current or planned.

The Polaris MZR Razor, however, does fit inside an Osprey or CH47, at the expense of having zero survivability. It's pretty ironic, the not-street-legal MZR Razor is the same size, weight, and horsepower as the WW2 Jeep and kubel/schwimmwagens (which are street legal).